Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e932bff55d2b2ba…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 08:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75e68e10455a61092fbcc5d2cc790cf9 SHA-1: 98289b7f167f099eb83c40c6a0507f59102aeff0 SHA-256: 0e932bff55d2b2bacc4313db62497ef4d46d85b911baaaaf594cc6a8e44c9706
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure strongly suggest this file is intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=pradeep+fundamental+physics+class+11+pdf PDF link annotation
    • http://ducnhua.com/upload/files/kuwab.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/77725137285.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/gikobopi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kudotelugiv.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907222531_2134271034.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8895676227.pdfIn PDF document text
    • https://gangnampools.com/contents/files/disegikuvaver.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/36240712096.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/biwitidoletofonuxaponito.pdfIn PDF document text
    • https://stopserv.ru/files/file/98547615016.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/dajolo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/barovuselonoxuvurepuzutad.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/jumosoxafe.pdfIn PDF document text
    • http://viettruss.com/upload/file/86622922640.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/79838895846.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/fitibe.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/texos.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/xosilikisuxibariwid.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/5213649819.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908020601104897.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/11170267159.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zojatanofit.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9eb6b6becd296a42faf8319df737213c/givolanemasuxuxo.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/69941835785.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613294087a46b---29040534291.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/sivavujeragi.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/13782180137.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 11032 bytes
SHA-256: 77bf71ad03e20c3ea9a28d06121274464d563f262c301592430dcbc1b61c3841
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 18448 bytes
SHA-256: 58a756595fdbf8c2a9731ce4673e3104ca87453e04de2a83a58cc446a0e74f2c